sounds like you jarred something in that area pretty good on that kayaking trip , did you have pain in the hip area before the trip? if so i have been reading different articles on how mercury interfers with sulfer in the body and how a high sulfer diet will help with joint pain in the hip and lower back areas , they had also mentioned the suppliment msm ,which is an organic type of sulfer ,i am going to start taking that next month as soon as my body settles down from my last dental work visit